International aid group Médecins Sans Frontières acted on 24 cases of sexual harassment or abuse last year and fired 19 employees, it has revealed, as the British charity Oxfam faces questions over its handling of a sexual misconduct scandal.

The Paris-based group, one of the world’s largest aid organisations, issued a statement saying it had received 146 complaints or alerts last year. “After an internal investigation, 40 cases were found to be allegations of harassment or abuse,” it said. “Of these, 24 were cases of harassment or sexual abuse.”